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the license plate parameters to the URL.
For example, the car plate is “MS12345”. Once it’s detected, the LPR camera will
send below URL to VMS:
http://192.168.7.121:8080/api/lpr?Caption = LPR&description = MS12345
If the license plate information is to be displayed in VMS, the VMS side needs to
extract it from the URL.
RTSP Type
Prerequisites
This part is implemented in onvif metadata. There are three streams in rtsp:
video
stream, audio stream, and alarm stream. Metadata alarm is performed through the
onvif alarm stream in the rtsp. So if the VMS or NVR supports and can receive the
onvif alarm stream in the rtsp, it can work with rtsp.
Integrate Method
We have defined the format of the XML. Knowing the XML format, VMS or NVR
can be
developed to be integrated, and LPR information can be displayed in VMS or NVR.
ex.) The contents of the xml include the date, time, license plate, and license
plate snapshot paths as shown below.
<tt:MetaDataStream>
<tt:Event>
<wsnt:NotificationMessage>
<wsnt:Topic
Dialect="http://www.onvif.org/ver10/tev/topicExpression/ConcreteSet">tns1:RuleEn
gine/LicensePlateDetector/LicensePlate</wsnt:Topic>
<wsnt:Message>
<tt:Message UtcTime="2018-05-15T06:19:34Z" PropertyOperation="Changed">